From his interview with uber-Republican Christianist Hugh Hewitt:
Right now, we are in a stage here in America where we’re going to decide a number of major factors. One of them is will America return to the historic roots, Christian roots, that are foundational for every one of our institutions. Or will we go the way of Europe, and go secular. The bottom line is that secularism doesn’t last, because no faith will always be filled by something else, and so that’s why Islam is making strong inroads into Europe, because faith of any kind will always beat no faith.
But the Christianists are pissed that he isn't publicly attacking marriage equality with more force. I note merely Warren's observation about the new atheists:
Well, first place, they’re making a ton of money, okay?